Reorganize project tree.

[libsigrok.git] / src / output / chronovu_la8.c

diff --git a/src/output/chronovu_la8.c b/src/output/chronovu_la8.c
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+++ b/src/output/chronovu_la8.c
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+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "output/chronovu-la8"
+
+struct context {
+       unsigned int num_enabled_channels;
+       gboolean triggered;
+       uint64_t samplerate;
+       uint64_t samplecount;
+       int *channel_index;
+       GString *pretrig_buf;
+};
+
+/**
+ * Check if the given samplerate is supported by the LA8 hardware.
+ *
+ * @param samplerate The samplerate (in Hz) to check.
+ *
+ * @return 1 if the samplerate is supported/valid, 0 otherwise.
+ */
+static gboolean is_valid_samplerate(uint64_t samplerate)
+{
+       unsigned int i;
+
+       for (i = 0; i < 255; i++) {
+               if (samplerate == (SR_MHZ(100) / (i + 1)))
+                       return TRUE;
+       }
+
+       return FALSE;
+}
+
+/**
+ * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants.
+ *
+ * LA8 hardware: sample period = (divcount + 1) * 10ns.
+ * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
+ * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
+ *
+ * @param samplerate The samplerate in Hz.
+ *
+ * @return The divcount value as needed by the hardware, or 0xff upon errors.
+ */
+static uint8_t samplerate_to_divcount(uint64_t samplerate)
+{
+       if (samplerate == 0 || !is_valid_samplerate(samplerate)) {
+               sr_warn("Invalid samplerate (%" PRIu64 "Hz)", samplerate);
+               return 0xff;
+       }
+
+       return (SR_MHZ(100) / samplerate) - 1;
+}
+
+static int init(struct sr_output *o)
+{
+       struct context *ctx;
+       struct sr_channel *ch;
+       GSList *l;
+
+       if (!o || !o->sdi)
+               return SR_ERR_ARG;
+
+       ctx = g_malloc0(sizeof(struct context));
+       o->internal = ctx;
+
+       for (l = o->sdi->channels; l; l = l->next) {
+               ch = l->data;
+               if (ch->type != SR_CHANNEL_LOGIC)
+                       continue;
+               if (!ch->enabled)
+                       continue;
+               ctx->num_enabled_channels++;
+       }
+       ctx->channel_index = g_malloc(sizeof(int) * ctx->num_enabled_channels);
+       ctx->pretrig_buf = g_string_sized_new(1024);
+
+       return SR_OK;
+}
+
+static int receive(struct sr_output *o, const struct sr_datafeed_packet *packet,
+               GString **out)
+{
+       const struct sr_datafeed_logic *logic;
+       struct context *ctx;
+       GVariant *gvar;
+       uint64_t samplerate;
+       gchar c[4];
+
+       *out = NULL;
+       if (!o || !o->sdi)
+               return SR_ERR_ARG;
+       if (!(ctx = o->internal))
+               return SR_ERR_ARG;
+
+       switch (packet->type) {
+       case SR_DF_HEADER:
+               /* One byte for the 'divcount' value. */
+               if (sr_config_get(o->sdi->driver, o->sdi, NULL, SR_CONF_SAMPLERATE,
+                               &gvar) == SR_OK) {
+                       samplerate = g_variant_get_uint64(gvar);
+                       g_variant_unref(gvar);
+               } else
+                       samplerate = 0;
+               c[0] = samplerate_to_divcount(samplerate);
+               *out = g_string_new_len(c, 1);
+               ctx->triggered = FALSE;
+               break;
+       case SR_DF_TRIGGER:
+               /* Four bytes (little endian) for the trigger point. */
+               c[0] = ctx->samplecount & 0xff;
+               c[1] = (ctx->samplecount >> 8) & 0xff;
+               c[2] = (ctx->samplecount >> 16) & 0xff;
+               c[3] = (ctx->samplecount >> 24) & 0xff;
+               *out = g_string_new_len(c, 4);
+               /* Flush the pre-trigger buffer. */
+               if (ctx->pretrig_buf->len)
+                       g_string_append_len(*out, ctx->pretrig_buf->str,
+                                       ctx->pretrig_buf->len);
+               ctx->triggered = TRUE;
+               break;
+       case SR_DF_LOGIC:
+               logic = packet->payload;
+               if (!ctx->triggered)
+                       g_string_append_len(ctx->pretrig_buf, logic->data, logic->length);
+               else
+                       *out = g_string_new_len(logic->data, logic->length);
+               ctx->samplecount += logic->length / logic->unitsize;
+               break;
+       case SR_DF_END:
+               if (!ctx->triggered && ctx->pretrig_buf->len) {
+                       /* We never got a trigger, submit an empty one. */
+                       *out = g_string_sized_new(ctx->pretrig_buf->len + 4);
+                       g_string_append_len(*out, "\x00\x00\x00\x00", 4);
+                       g_string_append_len(*out, ctx->pretrig_buf->str, ctx->pretrig_buf->len);
+               }
+               break;
+       }
+
+       return SR_OK;
+}
+
+static int cleanup(struct sr_output *o)
+{
+       struct context *ctx;
+
+       if (!o || !o->sdi)
+               return SR_ERR_ARG;
+
+       if (o->internal) {
+               ctx = o->internal;
+               g_string_free(ctx->pretrig_buf, TRUE);
+               g_free(ctx->channel_index);
+               g_free(o->internal);
+               o->internal = NULL;
+       }
+
+       return SR_OK;
+}
+
+SR_PRIV struct sr_output_format output_chronovu_la8 = {
+       .id = "chronovu-la8",
+       .description = "ChronoVu LA8",
+       .init = init,
+       .receive = receive,
+       .cleanup = cleanup,
+};